US election: How other incumbents left the White House after losing

Donald Trump is joining a small group of US presidents who have lost the election while in the White House.

The last time this happened was in 1992, when President George HW Bush was denied a second term by Bill Clinton.

Eight years later, incumbent Vice-President Al Gore was defeated by another Bush.

We speak to two men who were there for the transitions.

Video by Chloe Kim